udp.c@ 25822

最後變更在這個檔案從25822是 25822,由 vboxsync 提交於 15 年前
NAT: -Wshadow fixes. Use RT_N2H and RT_H2N instead of ntoh and hton because the latter trigger this warning as well.
屬性 svn:eol-style 設為 `native`
檔案大小: 16.1 KB

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1	/*
2	* Copyright (c) 1982, 1986, 1988, 1990, 1993
3	* The Regents of the University of California. All rights reserved.
4	*
5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions
7	* are met:
8	* 1. Redistributions of source code must retain the above copyright
9	* notice, this list of conditions and the following disclaimer.
10	* 2. Redistributions in binary form must reproduce the above copyright
11	* notice, this list of conditions and the following disclaimer in the
12	* documentation and/or other materials provided with the distribution.
13	* 3. All advertising materials mentioning features or use of this software
14	* must display the following acknowledgement:
15	* This product includes software developed by the University of
16	* California, Berkeley and its contributors.
17	* 4. Neither the name of the University nor the names of its contributors
18	* may be used to endorse or promote products derived from this software
19	* without specific prior written permission.
20	*
21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31	* SUCH DAMAGE.
32	*
33	* @(#)udp_usrreq.c 8.4 (Berkeley) 1/21/94
34	* udp_usrreq.c,v 1.4 1994/10/02 17:48:45 phk Exp
35	*/
36
37	/*
38	* Changes and additions relating to SLiRP
39	* Copyright (c) 1995 Danny Gasparovski.
40	*
41	* Please read the file COPYRIGHT for the
42	* terms and conditions of the copyright.
43	*/
44
45	#include <slirp.h>
46	#include "ip_icmp.h"
47	#include "ctl.h"
48
49
50	/*
51	* UDP protocol implementation.
52	* Per RFC 768, August, 1980.
53	*/
54	#define udpcksum 1
55
56	void
57	udp_init(PNATState pData)
58	{
59	udp_last_so = &udb;
60	udb.so_next = udb.so_prev = &udb;
61	}
62
63	/* m->m_data points at ip packet header
64	* m->m_len length ip packet
65	* ip->ip_len length data (IPDU)
66	*/
67	void
68	udp_input(PNATState pData, register struct mbuf *m, int iphlen)
69	{
70	register struct ip *ip;
71	register struct udphdr *uh;
72	int len;
73	struct ip save_ip;
74	struct socket *so;
75	int ret;
76	int ttl;
77
78	DEBUG_CALL("udp_input");
79	DEBUG_ARG("m = %lx", (long)m);
80	ip = mtod(m, struct ip *);
81	DEBUG_ARG("iphlen = %d", iphlen);
82	Log2(("%R[IP4] iphlen = %d\n", &ip->ip_dst, iphlen));
83
84	udpstat.udps_ipackets++;
85
86	/*
87	* Strip IP options, if any; should skip this,
88	* make available to user, and use on returned packets,
89	* but we don't yet have a way to check the checksum
90	* with options still present.
91	*/
92	if (iphlen > sizeof(struct ip))
93	{
94	ip_stripoptions(m, (struct mbuf *)0);
95	iphlen = sizeof(struct ip);
96	}
97
98	/*
99	* Get IP and UDP header together in first mbuf.
100	*/
101	ip = mtod(m, struct ip *);
102	uh = (struct udphdr *)((caddr_t)ip + iphlen);
103
104	/*
105	* Make mbuf data length reflect UDP length.
106	* If not enough data to reflect UDP length, drop.
107	*/
108	len = RT_N2H_U16((u_int16_t)uh->uh_ulen);
109	Assert((ip->ip_len == len));
110	Assert((ip->ip_len + iphlen == m->m_len));
111
112	if (ip->ip_len != len)
113	{
114	if (len > ip->ip_len)
115	{
116	udpstat.udps_badlen++;
117	Log3(("NAT: IP(id: %hd) has bad size\n", ip->ip_id));
118	}
119	m_adj(m, len - ip->ip_len);
120	ip->ip_len = len;
121	}
122
123	/*
124	* Save a copy of the IP header in case we want restore it
125	* for sending an ICMP error message in response.
126	*/
127	save_ip = *ip;
128	save_ip.ip_len+= iphlen; /* tcp_input subtracts this */
129
130	/*
131	* Checksum extended UDP header and data.
132	*/
133	if (udpcksum && uh->uh_sum)
134	{
135	memset(((struct ipovly *)ip)->ih_x1, 0, 9);
136	((struct ipovly *)ip)->ih_len = uh->uh_ulen;
137	#if 0
138	/* keep uh_sum for ICMP reply */
139	uh->uh_sum = cksum(m, len + sizeof (struct ip));
140	if (uh->uh_sum)
141	{
142
143	#endif
144	if(cksum(m, len + iphlen))
145	{
146	udpstat.udps_badsum++;
147	Log3(("NAT: IP(id: %hd) has bad (udp) cksum\n", ip->ip_id));
148	goto bad;
149	}
150	}
151	#if 0
152	}
153	#endif
154
155	/*
156	* handle DHCP/BOOTP
157	*/
158	if (uh->uh_dport == RT_H2N_U16_C(BOOTP_SERVER))
159	{
160	bootp_input(pData, m);
161	goto done;
162	}
163
164	if ( pData->use_host_resolver
165	&& uh->uh_dport == RT_H2N_U16_C(53)
166	&& CTL_CHECK(RT_N2H_U32(ip->ip_dst.s_addr), CTL_DNS))
167	{
168	struct sockaddr_in dst, src;
169	src.sin_addr.s_addr = ip->ip_dst.s_addr;
170	src.sin_port = uh->uh_dport;
171	dst.sin_addr.s_addr = ip->ip_src.s_addr;
172	dst.sin_port = uh->uh_sport;
173	/* udp_output2 will do opposite operations on mbuf*/
174
175	m->m_data += sizeof(struct udpiphdr);
176	m->m_len -= sizeof(struct udpiphdr);
177	udp_output2(pData, NULL, m, &src, &dst, IPTOS_LOWDELAY);
178	goto done;
179	}
180	/*
181	* handle TFTP
182	*/
183	#ifndef VBOX_WITH_SLIRP_BSD_MBUF
184	if ( uh->uh_dport == RT_H2N_U16_C(TFTP_SERVER)
185	&& CTL_CHECK(RT_N2H_U32(ip->ip_dst.s_addr), CTL_TFTP))
186	{
187	tftp_input(pData, m);
188	goto done;
189	}
190	#endif
191
192	/*
193	* Locate pcb for datagram.
194	*/
195	so = udp_last_so;
196	if ( so->so_lport != uh->uh_sport
197	\|\| so->so_laddr.s_addr != ip->ip_src.s_addr)
198	{
199	struct socket *tmp;
200
201	for (tmp = udb.so_next; tmp != &udb; tmp = tmp->so_next)
202	{
203	if ( tmp->so_lport == uh->uh_sport
204	&& tmp->so_laddr.s_addr == ip->ip_src.s_addr)
205	{
206	so = tmp;
207	break;
208	}
209	}
210	if (tmp == &udb)
211	so = NULL;
212	else
213	{
214	udpstat.udpps_pcbcachemiss++;
215	udp_last_so = so;
216	}
217	}
218
219	if (so == NULL)
220	{
221	/*
222	* If there's no socket for this packet,
223	* create one
224	*/
225	if ((so = socreate()) == NULL)
226	{
227	Log3(("NAT: IP(id: %hd) failed to create socket\n", ip->ip_id));
228	goto bad;
229	}
230	if (udp_attach(pData, so, 0) == -1)
231	{
232	Log3(("NAT: IP(id: %hd) udp_attach errno = %d-%s\n",
233	ip->ip_id, errno, strerror(errno)));
234	sofree(pData, so);
235	goto bad;
236	}
237
238	/*
239	* Setup fields
240	*/
241	/* udp_last_so = so; */
242	so->so_laddr = ip->ip_src;
243	so->so_lport = uh->uh_sport;
244
245	if ((so->so_iptos = udp_tos(so)) == 0)
246	so->so_iptos = ip->ip_tos;
247
248	/*
249	* XXXXX Here, check if it's in udpexec_list,
250	* and if it is, do the fork_exec() etc.
251	*/
252	}
253
254	so->so_faddr = ip->ip_dst; /* XXX */
255	so->so_fport = uh->uh_dport; /* XXX */
256
257	/*
258	* DNS proxy
259	*/
260	if ( pData->use_dns_proxy
261	&& (ip->ip_dst.s_addr == RT_H2N_U32(RT_N2H_U32(pData->special_addr.s_addr) \| CTL_DNS))
262	&& (uh->uh_dport == RT_H2N_U16_C(53)))
263	{
264	dnsproxy_query(pData, so, m, iphlen);
265	goto done;
266	}
267
268	iphlen += sizeof(struct udphdr);
269	m->m_len -= iphlen;
270	m->m_data += iphlen;
271
272	/*
273	* Now we sendto() the packet.
274	*/
275	if (so->so_emu)
276	udp_emu(pData, so, m);
277
278	ttl = ip->ip_ttl = save_ip.ip_ttl;
279	ret = setsockopt(so->s, IPPROTO_IP, IP_TTL, (const char*)&ttl, sizeof(ttl));
280	if (ret < 0)
281	LogRel(("NAT: Error (%s) occurred while setting TTL(%d) attribute "
282	"of IP packet to socket %R[natsock]\n", strerror(errno), ip->ip_ttl, so));
283
284	if (sosendto(pData, so, m) == -1)
285	{
286	m->m_len += iphlen;
287	m->m_data -= iphlen;
288	*ip = save_ip;
289	DEBUG_MISC((dfd,"NAT: UDP tx errno = %d-%s (on sent to %R[IP4])\n", errno,
290	strerror(errno), &ip->ip_dst));
291	icmp_error(pData, m, ICMP_UNREACH, ICMP_UNREACH_NET, 0, strerror(errno));
292	/* in case we receive ICMP on this socket we'll aware that ICMP has been already sent to host*/
293	so->so_m = NULL;
294	}
295
296	if (so->so_m)
297	m_free(pData, so->so_m); /* used for ICMP if error on sorecvfrom */
298
299	/* restore the orig mbuf packet */
300	m->m_len += iphlen;
301	m->m_data -= iphlen;
302	*ip = save_ip;
303	so->so_m = m; /* ICMP backup */
304
305	return;
306
307	bad:
308	Log2(("NAT: UDP(id: %hd) datagram to %R[IP4] with size(%d) claimed as bad\n",
309	ip->ip_id, &ip->ip_dst, ip->ip_len));
310	done:
311	/* some services like bootp(built-in), dns(buildt-in) and dhcp don't need sockets
312	* and create new m'buffers to send them to guest, so we'll free their incomming
313	* buffers here.
314	*/
315	m_freem(pData, m);
316	return;
317	}
318
319	int udp_output2(PNATState pData, struct socket so, struct mbuf m,
320	struct sockaddr_in saddr, struct sockaddr_in daddr,
321	int iptos)
322	{
323	register struct udpiphdr *ui;
324	int error = 0;
325
326	DEBUG_CALL("udp_output");
327	DEBUG_ARG("so = %lx", (long)so);
328	DEBUG_ARG("m = %lx", (long)m);
329	DEBUG_ARG("saddr = %lx", (long)saddr->sin_addr.s_addr);
330	DEBUG_ARG("daddr = %lx", (long)daddr->sin_addr.s_addr);
331
332	/*
333	* Adjust for header
334	*/
335	m->m_data -= sizeof(struct udpiphdr);
336	m->m_len += sizeof(struct udpiphdr);
337
338	/*
339	* Fill in mbuf with extended UDP header
340	* and addresses and length put into network format.
341	*/
342	ui = mtod(m, struct udpiphdr *);
343	memset(ui->ui_x1, 0, 9);
344	ui->ui_pr = IPPROTO_UDP;
345	ui->ui_len = RT_H2N_U16(m->m_len - sizeof(struct ip));
346	/* XXXXX Check for from-one-location sockets, or from-any-location sockets */
347	ui->ui_src = saddr->sin_addr;
348	ui->ui_dst = daddr->sin_addr;
349	ui->ui_sport = saddr->sin_port;
350	ui->ui_dport = daddr->sin_port;
351	ui->ui_ulen = ui->ui_len;
352
353	/*
354	* Stuff checksum and output datagram.
355	*/
356	ui->ui_sum = 0;
357	if (udpcksum)
358	{
359	if ((ui->ui_sum = cksum(m, /* sizeof (struct udpiphdr) + */ m->m_len)) == 0)
360	ui->ui_sum = 0xffff;
361	}
362	((struct ip *)ui)->ip_len = m->m_len;
363	((struct ip *)ui)->ip_ttl = ip_defttl;
364	((struct ip *)ui)->ip_tos = iptos;
365
366	udpstat.udps_opackets++;
367
368	error = ip_output(pData, so, m);
369
370	return error;
371	}
372
373	int udp_output(PNATState pData, struct socket so, struct mbuf m,
374	struct sockaddr_in *addr)
375	{
376	struct sockaddr_in saddr, daddr;
377
378	saddr = *addr;
379	if ((so->so_faddr.s_addr & RT_H2N_U32(pData->netmask)) == pData->special_addr.s_addr)
380	{
381	saddr.sin_addr.s_addr = so->so_faddr.s_addr;
382	if ((so->so_faddr.s_addr & RT_H2N_U32(~pData->netmask)) == RT_H2N_U32(~pData->netmask))
383	saddr.sin_addr.s_addr = alias_addr.s_addr;
384	}
385
386	/* Any UDP packet to the loopback address must be translated to be from
387	* the forwarding address, i.e. 10.0.2.2. */
388	if ( (saddr.sin_addr.s_addr & RT_H2N_U32_C(IN_CLASSA_NET))
389	== RT_H2N_U32_C(INADDR_LOOPBACK & IN_CLASSA_NET))
390	saddr.sin_addr.s_addr = alias_addr.s_addr;
391
392	daddr.sin_addr = so->so_laddr;
393	daddr.sin_port = so->so_lport;
394
395	return udp_output2(pData, so, m, &saddr, &daddr, so->so_iptos);
396	}
397
398	int
399	udp_attach(PNATState pData, struct socket *so, int service_port)
400	{
401	struct sockaddr_in *addr;
402	struct sockaddr sa_addr;
403	socklen_t socklen = sizeof(struct sockaddr);
404	int status;
405	int opt = 1;
406
407	if ((so->s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
408	goto error;
409	/*
410	* Here, we bind() the socket. Although not really needed
411	* (sendto() on an unbound socket will bind it), it's done
412	* here so that emulation of ytalk etc. don't have to do it
413	*/
414	memset(&sa_addr, 0, sizeof(struct sockaddr));
415	addr = (struct sockaddr_in *)&sa_addr;
416	#ifdef RT_OS_DARWIN
417	addr->sin_len = sizeof(struct sockaddr_in);
418	#endif
419	addr->sin_family = AF_INET;
420	addr->sin_port = service_port;
421	addr->sin_addr.s_addr = pData->bindIP.s_addr;
422	fd_nonblock(so->s);
423	if (bind(so->s, &sa_addr, sizeof(struct sockaddr_in)) < 0)
424	{
425	int lasterrno = errno;
426	closesocket(so->s);
427	so->s = -1;
428	#ifdef RT_OS_WINDOWS
429	WSASetLastError(lasterrno);
430	#else
431	errno = lasterrno;
432	#endif
433	goto error;
434	}
435	/* success, insert in queue */
436	so->so_expire = curtime + SO_EXPIRE;
437	/* enable broadcast for later use */
438	setsockopt(so->s, SOL_SOCKET, SO_BROADCAST, (const char *)&opt, sizeof(opt));
439	status = getsockname(so->s, &sa_addr, &socklen);
440	Assert(status == 0 && sa_addr.sa_family == AF_INET);
441	so->so_hlport = ((struct sockaddr_in *)&sa_addr)->sin_port;
442	so->so_hladdr.s_addr = ((struct sockaddr_in *)&sa_addr)->sin_addr.s_addr;
443	SOCKET_LOCK_CREATE(so);
444	QSOCKET_LOCK(udb);
445	insque(pData, so, &udb);
446	NSOCK_INC();
447	QSOCKET_UNLOCK(udb);
448	return so->s;
449	error:
450	LogRel(("NAT: can't create datagramm socket\n"));
451	return -1;
452	}
453
454	void
455	udp_detach(PNATState pData, struct socket *so)
456	{
457	if (so != &pData->icmp_socket)
458	{
459	QSOCKET_LOCK(udb);
460	SOCKET_LOCK(so);
461	QSOCKET_UNLOCK(udb);
462	closesocket(so->s);
463	sofree(pData, so);
464	SOCKET_UNLOCK(so);
465	}
466	}
467
468	static const struct tos_t udptos[] =
469	{
470	{ 0, 53, IPTOS_LOWDELAY, 0 }, /* DNS */
471	{ 517, 517, IPTOS_LOWDELAY, EMU_TALK }, /* talk */
472	{ 518, 518, IPTOS_LOWDELAY, EMU_NTALK }, /* ntalk */
473	{ 0, 7648, IPTOS_LOWDELAY, EMU_CUSEEME }, /* Cu-Seeme */
474	{ 0, 0, 0, 0 }
475	};
476
477	u_int8_t
478	udp_tos(struct socket *so)
479	{
480	int i = 0;
481
482	while(udptos[i].tos)
483	{
484	if ( (udptos[i].fport && RT_N2H_U16(so->so_fport) == udptos[i].fport)
485	\|\| (udptos[i].lport && RT_N2H_U16(so->so_lport) == udptos[i].lport))
486	{
487	so->so_emu = udptos[i].emu;
488	return udptos[i].tos;
489	}
490	i++;
491	}
492
493	return 0;
494	}
495
496	#ifdef EMULATE_TALK
497	#include "talkd.h"
498	#endif
499
500	/*
501	* Here, talk/ytalk/ntalk requests must be emulated
502	*/
503	void
504	udp_emu(PNATState pData, struct socket so, struct mbuf m)
505	{
506	so->so_emu = 0;
507	}
508
509	struct socket *
510	udp_listen(PNATState pData, u_int32_t bind_addr, u_int port, u_int32_t laddr, u_int lport, int flags)
511	{
512	struct sockaddr_in addr;
513	struct socket *so;
514	socklen_t addrlen = sizeof(struct sockaddr_in);
515	int opt = 1;
516
517	if ((so = socreate()) == NULL)
518	return NULL;
519
520	so->s = socket(AF_INET, SOCK_DGRAM, 0);
521	if (so->s == -1)
522	{
523	LogRel(("NAT: can't create datagram socket\n"));
524	RTMemFree(so);
525	return NULL;
526	}
527	so->so_expire = curtime + SO_EXPIRE;
528	fd_nonblock(so->s);
529	SOCKET_LOCK_CREATE(so);
530	QSOCKET_LOCK(udb);
531	insque(pData, so, &udb);
532	NSOCK_INC();
533	QSOCKET_UNLOCK(udb);
534
535	memset(&addr, 0, sizeof(addr));
536	#ifdef RT_OS_DARWIN
537	addr.sin_len = sizeof(addr);
538	#endif
539	addr.sin_family = AF_INET;
540	addr.sin_addr.s_addr = bind_addr;
541	addr.sin_port = port;
542
543	if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0)
544	{
545	LogRel(("NAT: bind to %R[IP4] has been failed\n", &addr.sin_addr));
546	udp_detach(pData, so);
547	return NULL;
548	}
549	setsockopt(so->s, SOL_SOCKET, SO_REUSEADDR,(char *)&opt, sizeof(int));
550	/* setsockopt(so->s, SOL_SOCKET, SO_OOBINLINE,(char )&opt, sizeof(int)); /
551
552	getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
553	so->so_fport = addr.sin_port;
554	/* The original check was completely broken, as the commented out
555	* if statement was always true (INADDR_ANY=0). */
556	/* if (addr.sin_addr.s_addr == 0 \|\| addr.sin_addr.s_addr == loopback_addr.s_addr) */
557	if (1 == 0) /* always use the else part */
558	so->so_faddr = alias_addr;
559	else
560	so->so_faddr = addr.sin_addr;
561
562	so->so_lport = lport;
563	so->so_laddr.s_addr = laddr;
564	if (flags != SS_FACCEPTONCE)
565	so->so_expire = 0;
566
567	so->so_state = SS_ISFCONNECTED;
568
569	return so;
570	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/udp.c@ 25822

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